Valve-gear for engines



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- R. N. PERCY.

VALVE GEAR FOR ENGINES.

No. 409,061. Patented Aug. 1,3, 1889.

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2 Sheets-'Sheet 2. R. N. PERGY. VALVE GEAR FOR ENGINES.

No. 409,061'. Patented Aug. .13, 1889.

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WITNEEEEE- UNITED STATES PATENT OFFICE.

ROBERT N. PEROY, OF BATTLE CREEK, MICHIGAN.

`VALVEGEAR FOR ENGINES.

SPECIFICATION forming part of Letters Patent No. 409,061, dated August 13, 1889.

l Application led February 7, 1889. Serial No. 299,068. (No model.)

To all whom t may concern:V

Be it known that I, ROBERT N. PERCY, a citizen of the United States, residing at Battle Oreck, in the county of Calhoun and State of Michigan, have invented certain new and useful Improvements in Valve-Gear for Engines, of which the following is a specification, reference being' had to the accompanying drawings, making a part of this application.

The object of this improvement is to prolvide a durable, easily-con structed, and reliable substitute for the link-motion, so called; and it consists in certain peculiarities in the construction, arrangement, and combination of parts, substantially as hereinafter set forth, and particularly setforth in the subjoined claims.

My improvement relates toa novel arrangement of the actuating-lever and reversinggear carrying a shifting eccentric, in connectionv with double-incline planes placed in reverse position on the engine-shaft, means for holding and guiding said eccentric and for adj ustably iixing the incline planes relatively to the eccentric-slot and operative parts, whereby the lost motion caused by wear is readily corrected, and also new methods for reducing the friction of the reversing-device surfaces to a minimum, and tendency to torsion is overcome. Other obvious advantages incidentally accrue, which will fully appear presently.

In the drawings, wherein like letters and iigures of reference designate corresponding parts in all the views, Figure I is a side view of the shifting eccentric,.showing the position thereof at half-stroke and the main engineshaft in cross-section. Fig. II is a central horizontal section of my invention, giving a longitudinal view of that portion of the engine-shaft on which it operates, showing the incline planes in proper position when the eccentric-rod is at the extremity of its backward stroke. Fig. III is a horizontal section of the eccentric, showing a portion of the shaft, the eccentric-disk D, and the sliding collar er sleeve D. Fig. IV is thatform of the eccentric having its shaft and incline-plane slots in its center, with its rod 1I reaching at" right angles therewith, and showing the shaft in center of said eccentric in cross-section.

Fig. V is a horizontal section of the eccentric embracing disks and guides D D showing the manner of removably attaching them to the engine-shaft by means of the set-screws t t. Fig. VI isa side view of the eccentric with the engine-shaft in cross-section, exactly similar in form to that shown in Fig. IV, save that here the slot for the eccentric and incline planes is placed upon one side of the center thereof for the purpose of securing greater precision of the valve-motion throughout its stroke, according' to the length of rod and angle of advance of the varying styles of engines now in use. Fig. VII is an enlarged section of that portion of the eccentric shown on line .r 0c, Fig. IV, where the Wedge or inclineplane slot is represented at'm m, and Where a shoe la engages between said incline plane and the adjacent shoulder of the eccentric.

(See FigaVII.) This shoe is to facilitate the fitting to and reduce the friction of the contacting parts at this point.

A A are the incline planes or wedge-shaped blocks, of suitable length and thickness, placed central and longitudinally equidistant above and below the shaft. These incline planes are nicely fitted to, and, with the shaft and eccentric-disk bearings, slidingly fill and iit the vertical slots of the eccentric. The larger end of the incline plane A is firmly iixed to the shifting and sliding sleeve D by means of the bolt c', While its opposite and smaller end is provided with the bolt and adjustable nuts c, by means of which lost motion caused by wear is corrected. The two incline planes A and A being thus placed and adjusted in relatively opposite positions on the main shaft, at all times fit and fill the eccentric slots at any and every point of their sliding movement on the shaft, as clearly seen by dotted lines, Figs. I and II.

B is the main engineshaft, and D D are eccentric embracing-disks, provided With suitable sleeves for the purpose of removably {ixing them to the shaft by means of set-screws t t. (See Fig. V.) These disks are slotted suitably to receive the incline planes AA', in form corresponding to thc slots of the eccentric m m, as clearly shown in' Figs. I, II, IV, and VI. Y

Sliding sleeves or disks D D loosely play IOG on the shaft B, and to these are firmly fixed the incline planes A A', vertically of and eqnidistant from the shaft center, as already seen, thus forming a revolving frame carrying the sliding incline planes and its sliding connections along on the said shaftlongitudinally, while the vertically-shifting eccentric Y l'emains stationary on, yet revolving with, the shaft, but governed in its vertical movement and consequent oscillations of its rod 'L' by means of the sliding devices described, actuated through the well-known hand-lever 7L and its bell crank and engaging disk or sleeve D.

The shifting eccentric Y is provided with a central or nearly central slot for passing the sleeve of the fixed disk D in the usual manner, and to receive my improved inclined planes A A' and shaftl, and when that device is employedthe tops of the eccentric-slots m lm should be pivoted to the shoe 7c, as shown, Fig. VII.

The fixed eccentric embracing-disk 1) is provided with a V-sha-ped vertical channel f7, -which engages with and forms a way or track and guide for aV-shaped corresponding projection, with which the shifting eccentric is provided, said project-ion and way running parallel and vertical with the eccentric-slots m fm, the olice of which is to reduce the friction encountered in shiftingthe eccentric from the tendency to torsion at this point.

There sufficient space on the mainengineshaft cannot readily be found for attaching my improvement, a sub-shaft having revolution in equal time may be employed at slight cost, and thus my improved substitute for the costly and complex link heretofore mostly in common use' may be adopted with useful l results.

Having thus fully illustrated and described my invention, what l claim, and desire to sccure by Letters Patent' of the United States, 1s-

1. In an engine valve-gear, a shaft, and ineline planes placed above and below said shaft, in combination with a vertically-shifting eccentric formed with a slot adapted to receive said incline planes, and a shoe having its bearing on the top of said incline planes. 5o

2. In an engine valve-gear, a shaft and ineline planes placed centrally above and. below said shaft, in combination with a vertically-shifting eccentric provided with a shoe having its bearing on the top of the said ineline planes.

3. In an engine valve-gear, a shaft, incline planes placed above and below said shaft, and a shoe having its bearing on said incline planes, in combination with a shifting eceen- 6o tric pivoted to said shoe, substantially as shown, and for the purpose set forth.

4. In an engine valve-gear, the shaft provided With a revolving frame, which. frame consists of sliding sleeves and incline planes, 6 5 in combination with a shifting eccentric and a shoe having its bearing on said incline planes.

5. ln an engine valve-gear, a shaft, incline planes placed above and below said shaft, 7o and a slotted embracing-disk for said incline planes, in combination with a shifting eccentric and a shoe having its bearing on said incline planes.

ln testimony that I claim the foregoing I hereunto al'ix my signature in the presence of two attesting witnesses.

ROBERT N. PERCY.

Witnesses:

FRANK W. CLAPP, ALEX N. ZANc. 

